Either / or applies.
Ideally you will use all 10 tests within one property; but you could take a single wipe throughout the whole property to get an indication. You would still need to follow up with a more scientific test if you get a positive result, and this is where the real money goes.
Ideally you will use all 10 tests within one property; but you could take a single wipe throughout the whole property to get an indication. You would still need to follow up with a more scientific test if you get a positive result, and this is where the real money goes.
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